software/gitlab: fix rpath for nokogiri

This was using zlib and lzma from system if they are available, so we
tell bundler to use the slapos version.

We have to use both in --with-cflags for nokogiri itself and as CFLAGS
environ for when nokogiri build its included libxml2

software/gitlab/software.cfg

@@ -14,6 +14,7 @@ extends =
     ../../component/nodejs/buildout.cfg
     ../../component/openssl/buildout.cfg
     ../../component/nginx/buildout.cfg
+    ../../component/xz-utils/buildout.cfg
     ../../component/zlib/buildout.cfg
     ../../component/icu/buildout.cfg
     gowork.cfg
@@ -182,14 +183,16 @@ bundle  = ${bundler-4gitlab:bundle}
 configure-command = cd ${:path} &&
     ${:bundle} config --local build.charlock_holmes --with-icu-dir=${icu:location}  &&
     ${:bundle} config --local build.pg --with-pg-config=${postgresql10:location}/bin/pg_config &&
-    ${:bundle} config --local build.re2 --with-re2-dir=${re2:location}
+    ${:bundle} config --local build.re2 --with-re2-dir=${re2:location} &&
+    ${:bundle} config --local build.nokogiri --with-zlib-dir=${zlib:location} --with-cflags=-I${xz-utils:location}/include --with-ldflags="-L${xz-utils:location}/lib -Wl,-rpath=${xz-utils:location}/lib"
 
 make-binary =
 make-targets= cd ${:path} &&
     ${:bundle} install --deployment  --without development test mysql aws kerberos
 environment =
-  PKG_CONFIG_PATH=${openssl-1.0:location}/lib/pkgconfig:${re2:location}/lib/pkgconfig
+  PKG_CONFIG_PATH=${openssl-1.0:location}/lib/pkgconfig:${re2:location}/lib/pkgconfig:${xz-utils:location}/lib/pkgconfig
   PATH=${pkgconfig:location}/bin:%(PATH)s
+  CFLAGS=-I${xz-utils:location}/include
 
 ################## Google re2
 [re2]